Set the volume level of all channels to the same volume.

equalizeVolumeBalance.py

"""
Sets the volume level of all channels to the same volume.
It chooses the minimum of all volume levels.

Requirements
 - Windows 10
 - pip install pycaw

"""

from ctypes import cast, POINTER
from comtypes import CLSCTX_ALL
from pycaw.pycaw import AudioUtilities, IAudioEndpointVolume

devices = AudioUtilities.GetSpeakers()
interface = devices.Activate(IAudioEndpointVolume._iid_, CLSCTX_ALL, None)
volume = cast(interface, POINTER(IAudioEndpointVolume))

# Calculate minimum
minVol = 1.0
for i in range(volume.GetChannelCount()):
    minVol = min(minVol, volume.GetChannelVolumeLevel(i))

# Set all channels to the minimum
for i in range(volume.GetChannelCount()):
    volume.SetChannelVolumeLevel(i, minVol, None)

# Print new volume percentage
scalar = int(volume.GetChannelVolumeLevelScalar(i) * 100)
print(f"{'🔈🔉🔊'[len(str(scalar)) - 1]} {scalar}% [{volume.GetChannelCount()} channels]")